JP7449456B2 - Circuit control method, battery and its controller and management system, power receiving device - Google Patents

Description

Embodiments of the present application relate to the technical field of batteries, and specifically relate to a circuit control method, a battery controller, a battery management system, a battery, a power receiving device, and a vehicle.

Batteries are widely applied in electronic devices, such as mobile phones, notebook computers, electric vehicles, automobiles, airplanes, steamers, toy cars, toy steamers, toy airplanes, and power tools.

In the development of battery technology, safety issues are a problem that cannot be ignored, especially when batteries are overcharged, which is likely to cause serious safety accidents. Therefore, how to avoid battery overcharging and improve battery safety is one of the issues that has attracted attention in this field.

In view of the above problems, embodiments of the present invention provide a circuit control method, a battery controller, a battery management system, a battery, a power receiving device, and a vehicle that can prevent overcharging of a battery and improve battery safety. do.

According to a first aspect of embodiments of the present application, the step of obtaining a device wake-up signal includes the step of: obtaining a device wake-up signal; the charging circuit is a circuit that connects a battery on the device and a generator, and the power supply terminal voltage is the output voltage of the generator. In a certain step, if the power supply terminal voltage of the battery charging circuit on the device is greater than a first threshold and the rate of change within the first time length is less than a second threshold, A circuit control method is provided, including the step of issuing a first command for controlling a first switching unit to close and turn on the charging circuit.

According to the circuit control method according to the embodiment of the present application, the device wake-up signal and the power supply terminal voltage of the charging circuit are obtained, and the power supply terminal voltage of the charging circuit is larger than the first threshold value and within the first time length. is less than a second threshold, there is a device wake-up signal only after the device has been started, the power supply terminal voltage of the charging circuit is greater than a first threshold, and the first Since the rate of change within the time length of is less than the second threshold, this method controls the battery charging circuit to turn on when all the above conditions are met. This allows the device to be started already when the device is not started, so that the battery charging circuit is turned on when the device is not started, and then when the device is started, a large current is generated in the battery charging circuit. It causes discharge and avoids the switch on the charging circuit from sticking, avoids battery thermal runaway due to overcharging of lithium batteries, and improves battery safety.

In some embodiments, the method includes determining whether the battery's state of charge SOC is greater than a third threshold, whether the battery has a fault alarm, and whether the battery's battery cell temperature is greater than a third threshold. further comprising the step of determining whether the power supply terminal voltage of the battery charging circuit on the device is greater than a first threshold and the rate of change within the first time length is within a second range. , the step of issuing a first command includes the step of issuing a first command when the power supply terminal voltage of the battery charging circuit on the device is greater than the first threshold and the rate of change within the first time length is less than the second threshold. is below, the SOC of the battery is greater than a third threshold, the battery has no failure alarm, and the battery cell temperature of the battery is within a first range, the step of issuing a first command; Including further.

In the above embodiment, determining whether the SOC of the battery is greater than a third threshold value, whether the battery has a failure alarm, and whether the battery cell temperature of the battery is within the first range. By controlling the charging circuit of the battery to be turned on only when the SOC of the battery is greater than the third threshold, the battery has no failure alarm, and the battery cell temperature of the battery is within the first range. , can avoid battery floating charging and safety problems.

In some embodiments, the method determines whether the rate of change of the battery's charging current within a second length of time is greater than a fourth threshold after the battery's charging circuit is turned on. , or whether the voltage of a battery cell in the battery is greater than or equal to a fifth threshold; or whether the battery has a fault alarm; or whether the temperature of the battery cell is not within a first range. , or determining whether the SOC of the battery is less than or equal to a third threshold, and a rate of change of the charging current of the battery within a second time length is greater than a fourth threshold, or If the voltage of a battery cell in the battery is greater than or equal to a fifth threshold, or if the battery has a failure alarm, or if the temperature of the battery cell is not within the first range, or If the SOC is less than or equal to a third threshold, turning off a first switching unit in the charging circuit and issuing a second command for controlling the charging circuit to turn off; include.

In the above embodiment, determining whether the SOC of the battery is greater than a third threshold value, whether the battery has a failure alarm, and whether the battery cell temperature of the battery is within the first range. By controlling the charging circuit of the battery to be turned on only when the SOC of the battery is greater than the third threshold, the battery has no failure alarm, and the battery cell temperature of the battery is within the first range. , can avoid battery floating charging and safety problems.

In some embodiments, the method includes determining whether there is a device wake-up signal and whether the power terminal voltage is less than a sixth threshold; and when the power supply terminal voltage is less than a sixth threshold, a first switching unit in the charging circuit is closed, the charging circuit is turned on, and the charging circuit is placed in a first on state. The method further includes the step of issuing a third command for controlling the method.

In the above embodiment, determining whether there is a device wake-up signal and whether the power terminal voltage is less than the sixth threshold determines whether the device wake-up signal is present and the power terminal voltage is less than the sixth threshold. 6, the charging circuit is turned on to charge the lead-acid battery from the lithium battery, and when the vehicle is left unattended for a long time, the lead-acid battery runs out of power and the vehicle cannot be started. This problem was avoided.

In some embodiments, the method includes determining whether the SOC of the battery is greater than a seventh threshold and whether there is a fault alarm on the battery, and the method includes determining whether the battery has a fault alarm, and the device wake-up signal and the power supply terminal voltage is less than a sixth threshold, issuing a third command includes a device wake-up signal, the power supply terminal voltage is less than the sixth threshold, and the battery The method further includes issuing a third command if the SOC of the battery is greater than a seventh threshold and there is no failure alarm for the battery.

In the above embodiment, by determining whether the SOC of the battery is greater than the seventh threshold and whether the battery has a failure alarm, the SOC of the battery is greater than the seventh threshold, and If the battery does not have a failure alarm, the charging circuit is turned on to avoid over-discharge of the lithium battery and safety issues.

In some embodiments, the method includes determining whether the on-time of the charging circuit is greater than an eighth threshold in the first on-state; If the charging circuit is larger than a threshold of 8, turning off a first switching unit of the charging circuit and issuing a fourth command for controlling the charging circuit to turn off.

In the above embodiment, by determining whether the on-time of the charging circuit is greater than the eighth threshold, if the on-time of the charging circuit is greater than the eighth threshold, the charging circuit is turned off. This not only ensures that the lead-acid battery is charged from the lithium battery until the amount of power required for the vehicle to start at one time is met, but also avoids over-discharging of the lithium battery.

In some embodiments, the method includes determining whether the SOC of the battery is greater than a seventh threshold; and discharging the battery if the SOC of the battery is greater than the seventh threshold. issuing a fifth command for controlling a second switching unit of a circuit to close and turn on the discharge circuit, the discharge circuit being connected to a battery on the device and a powered device. This is a circuit that connects the

In the above embodiment, by determining whether the SOC of the battery is greater than the seventh threshold, if the SOC of the battery is greater than the seventh threshold, the battery discharging circuit is controlled to be turned on. , avoiding over-discharge of lithium batteries.

In some embodiments, the method determines whether there is a device wake-up signal, or whether there is a fault alarm on the battery, or whether the battery has a fault alarm after the battery's discharge circuit is turned on. determining whether the SOC of the battery is less than or equal to a seventh threshold; and if the device wake-up signal is present or the battery has a failure alarm, the SOC of the battery is less than or equal to a seventh threshold; In this case, the method further includes the step of turning off a second switching unit of the discharge circuit and issuing a sixth command for controlling the discharge circuit to turn off.

In the above embodiments, the device wake-up signal may be activated by determining whether there is no device wake-up signal, or whether there is a fault alarm on the battery, or whether the SOC of the battery is less than or equal to the seventh threshold. If there is no up signal, or the battery has a fault alarm, or the SOC of the battery is below the seventh threshold, it will control the discharge circuit to turn on, preventing lithium battery over-discharge and safety problems. avoided.

According to a second aspect of embodiments of the present application, there is provided a battery controller including one or more processors operating alone or in combination for performing the steps of the circuit control method described above.
According to a third aspect of embodiments of the present application, the invention comprises at least one processor and a memory communicatively connected to the at least one processor, wherein the memory includes instructions executable by the at least one processor. is stored, and the instructions are executed by the at least one processor to cause the at least one processor to implement the steps of the circuit control method described above.

A fourth aspect of embodiments of the present application provides a battery including the battery controller described above or the battery management system described above.

A fifth aspect of the embodiments of the present application provides a power receiving device including the above-mentioned battery for supplying electric energy.

According to a sixth aspect of the embodiment of the present application, the lithium battery includes a lithium battery, a generator, and a vehicle wake-up switch, the lithium battery and the generator are connected to form a charging circuit, and the lithium battery is , obtaining a vehicle wake-up; the power supply terminal voltage of a charging circuit for a lithium battery on the vehicle is greater than a first threshold, and the rate of change within a first length of time is less than a second threshold; the charging circuit is a circuit connecting a lithium battery on the vehicle to a generator, and the power supply terminal voltage is an output voltage of the generator; When the power supply terminal voltage of the charging circuit is larger than a first threshold value and the rate of change within the first time length is less than a second threshold value, the first switching unit in the charging circuit is closed. , and issuing a first command for controlling the charging circuit to turn on.

The above description is only a summary of the technical content of the present application, and in order to make the technical means of the present application more clearly understandable, it allows implementation according to the content of the specification, and furthermore, the above and In order that other objects, features and advantages may be more clearly understood, the following detailed description of the present invention is set forth specifically.

Hereinafter, features, advantages, and technical effects of exemplary embodiments of the present application will be described with reference to the accompanying drawings.

3 is a flowchart of a circuit control method provided by some embodiments of the present application. FIG. 2 is a block diagram of a power system configuration of a power receiving device to which the method of FIG. 1 is applied. FIG. 2 is a circuit configuration diagram of a battery to which the method of FIG. 1 is applied. 3 is a flowchart of a circuit control method provided by some embodiments of the present application. 3 is a flowchart of a circuit control method provided by some embodiments of the present application. 3 is a flowchart of a circuit control method provided by some embodiments of the present application. 3 is a flowchart of a circuit control method provided by some embodiments of the present application. 3 is a flowchart of a circuit control method provided by some embodiments of the present application. 3 is a flowchart of a circuit control method provided by some embodiments of the present application. 3 is a flowchart of a circuit control method provided by some embodiments of the present application. 1 is a schematic diagram of a battery controller provided by some embodiments of the present application; FIG. 1 is a schematic configuration diagram of a battery management system provided by some embodiments of the present application; FIG. 1 is a schematic diagram of a battery provided by some embodiments of the present application; FIG. 1 is a schematic diagram of a battery provided by some embodiments of the present application; FIG. 1 is a schematic configuration diagram of a power receiving device provided by some embodiments of the present application. 1 is a schematic configuration diagram of a vehicle provided by some embodiments of the present application; FIG.

In order to make the objectives, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely explained below in conjunction with the drawings in the embodiments of the present application. do. It is clear that the described embodiments are some, but not all, embodiments of the present application. All other embodiments obtained by a person skilled in the art based on the embodiments herein without inventive efforts are within the scope of the claims herein.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the specification of the application is used only to describe specific embodiments and not to limit the application. The terms "comprising", "having" and any variations thereof in the specification, claims and above description of the drawings are intended to cover non-exclusive inclusion. Terms such as "first" and "second" in the specification and claims of the present application or the above drawings are used to distinguish between different objects and to explain a specific order or master-servant relationship. It doesn't belong to. In the description of this application, unless otherwise specified, the meaning of "plurality" refers to two or more than two.

Reference in this application to an "embodiment" means that the particular feature, structure, or property described in the embodiment may be included in at least one embodiment of the present application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are independent or alternative embodiments mutually exclusive of other embodiments. It should be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

As noted above, when the term "comprising" is used herein, it is used to clearly indicate the presence of said feature, integer, step, or assembly, but one or more other It should be emphasized that this does not exclude the presence or addition of features, integers, steps, assemblies or grouped features, integers, steps, assemblies. As used in this application, the singular forms "a", "an", and "the" include plural forms unless the context clearly dictates otherwise.

In this specification, "one" and "one" can refer to one, but can also match the meaning of "at least one" or "one or more." The term "about" generally refers to adding or subtracting 10% to or from the stated number, and more specifically refers to adding or subtracting 5% from the stated number. The term "or" used in the claims has the meaning "and/or", unless it is explicitly stated that it refers only to alternative solutions.
In this application, the term "and/or" is used merely to describe the relationship between related objects, and indicates that three types of relationships can exist, e.g., A and/or B , three cases can be shown: only A exists, A and B exist simultaneously, and only B exists. Further, the character "/" in the present application generally indicates that the objects related before and after the character are in an "or" relationship.

Batteries referred to in this field are classified into disposable batteries and rechargeable batteries depending on whether they are rechargeable or not. Disposable batteries (Primary Batteries) are commonly referred to as ``throw away as soon as they are used up'' batteries and primary batteries.Once their power is exhausted, they cannot be recharged and used, so they have no choice but to be discarded. be. A rechargeable battery is also called a secondary battery, a two-stage battery, or a storage battery. The manufacturing materials and processes of rechargeable batteries have the advantage that they can be recycled many times after charging, unlike disposable batteries, and the output current load capacity of rechargeable batteries is higher than most disposable batteries. The types of rechargeable batteries commonly found today are lead acid batteries, nickel metal hydride batteries, and lithium ion batteries. Lithium-ion batteries have advantages such as light weight, large capacity (1.5 to 2 times the capacity of nickel-metal hydride batteries of the same weight), no memory effect, and low self-discharge rate. Although it is expensive, it is commonly used.

The battery described in the examples of this application means a rechargeable battery. The concept of the present application will be explained below, mainly using lead-acid batteries and lithium ion batteries as examples. It should be understood that any other suitable type of rechargeable battery is applicable. A battery as referred to in the examples herein refers to a single physical module that includes one or more battery cells (also referred to as cells) to provide higher voltage and capacity. For example, batteries referred to in this application may include battery modules, battery packs, and the like. A battery cell includes a positive electrode tab, a negative electrode tab, an electrolyte, and a separator, and is a basic structural unit that constitutes a battery module or a battery pack. Commonly used positive electrode materials for lithium-ion batteries include lithium cobalt oxide, lithium manganate, lithium nickel oxide, lithium iron phosphate, and ternary materials (e.g., nickel cobalt lithium manganate), and commonly used negative electrode materials include , carbon materials (e.g., graphite), and silicon-based materials, and commonly used separator materials include polyolefin-based materials mainly composed of polyethylene (PE) or polypropylene (PP). Battery cells are generally divided into three types depending on the packaging method: cylindrical battery cells, prismatic battery cells, and soft pack battery cells.

Multiple battery cells can be connected in series and/or in parallel via electrode terminals and used for various application scenes. For high power applications such as electric vehicles, there are three levels of battery application: battery cells, battery modules, and battery packs. A battery module is a battery module in which a certain number of battery cells are electrically connected and housed in a single frame to protect the battery cells from external shocks, heat, vibrations, etc. A battery pack is the final state of a battery system installed in a vehicle. Most current battery packs are made by incorporating various control and protection systems, such as a battery management system (BMS) and thermal management members, into one or more battery modules. With the development of technology, the level of battery modules has become optional, ie, forming battery packs directly from battery cells. This improvement improves the gravimetric energy density and volumetric energy density of the battery system, and at the same time significantly reduces the number of parts. Batteries referred to in this application include battery modules and battery packs.

Currently, the power source on a vehicle is mainly used to start the engine, and generally a lead-acid battery or a lithium battery is used as the power source. As the socio-economic level improves, demands on vehicles for environmental protection, energy saving, and comfort are gradually increasing, and in-vehicle equipment that meets these demands has also appeared. For example, a parking air conditioner satisfies the user's requirements for comfort such as air temperature, humidity, flow velocity, etc. in the vehicle interior environment. Therefore, the power supply on the vehicle must meet the requirements for starting the engine under various environments, and at the same time meet the requirements for supplying power to on-vehicle electrical equipment such as a parking air conditioner when the vehicle is parked.

Lead-acid batteries have low price and stable quality, but are heavy, have a high self-discharge rate, and have a short lifespan. Lithium batteries are lightweight and small, have low self-discharge rates, and have a long service life, but lithium batteries with large capacity and high magnification are expensive and cannot meet the requirements for engine starting at low temperatures. Therefore, a lead-acid battery and a lithium battery connected in parallel are usually used as a starting and parking power source for vehicles.The lead-acid battery is mainly used to start the engine, and the lithium battery is mainly used to power the parking air conditioner. supply.

However, if a lead-acid battery and a lithium battery connected in parallel are used as a starting/parking power source for a vehicle, if the vehicle is started while the switch of the lithium battery charging circuit is closed, a large current discharge will occur in the lithium battery charging circuit. If the switch (e.g. relay) on the charging circuit sticks, the lithium battery will overcharge, leading to thermal runaway and safety accidents such as battery fire.

In view of the above, the present application provides a circuit control method, a battery controller, a battery management system, a battery, a power receiving device, and a vehicle, and the designs thereof will be described in detail below. It can be understood that the circuit control method, battery controller, battery management system, and battery described in the embodiments of the present application are applied to various devices that use batteries, particularly vehicles. For ease of explanation, the following embodiments will be described using applications to a vehicle as an example.

FIG. 1 is a flowchart of a circuit control method provided by some embodiments of the present application. This circuit control method 100 can be applied to a battery in a power receiving device, and can also be applied to a BMS of a battery.Hereinafter, the concept of the present application will be described using a BMS in which this method is applied to a battery on a vehicle as an example. Explain. The circuit control method is
S101, obtaining a device wake-up signal;
In S102, it is determined whether the power supply terminal voltage of the battery charging circuit on the device is greater than a first threshold value and the rate of change within the first time length is less than a second threshold value. , the charging circuit is a circuit connecting the battery on the device and the generator, and the power supply terminal voltage is the output voltage of the generator;
In S103, if the power supply terminal voltage of the battery charging circuit on the device is greater than the first threshold and the rate of change within the first time length is less than the second threshold, the issuing a first command for controlling the first switching unit to close and turn on the charging circuit.

FIG. 2 is a block diagram of a power system configuration of a power receiving device to which the method of FIG. 1 is applied. Referring to what is shown in FIG. 2, the power receiving device includes a parking power source (in this embodiment, a lithium battery is taken as an example), a lead acid battery, a generator, an engine, a vehicle wake-up switch, and a power receiving device. The first port P ₁₁ of the lithium battery is connected to the generator and the first port P ₂₁ of the lead-acid battery, respectively, forming a charging circuit A, and the second port P ₁₂ of the lithium battery is connected to the power receiving device. and forms a discharge circuit B between the lithium battery and the power receiving device. The first port _P21 of the lead-acid battery is also connected to the engine and forms a circuit C supplying power for engine starting. The third port _P13 of the lithium battery is connected to the vehicle wake-up switch and is used to receive the device wake-up signal.

The charging circuit is a circuit that connects the battery on the device and the generator, and specifically, it can be the charging circuit A that connects the lithium battery, generator, and lead-acid battery in FIG. 2. FIG. 3 is a circuit configuration diagram of a battery to which the method of FIG. 1 is applied, and the charging circuit can be the charging circuit A1 in FIG. 3.

The wake-up signal is an electrical signal for starting the device. For example, in a vehicle, the ON range of the vehicle keyhole is KL15, one end of which is connected to the on-vehicle power source, and the other end is connected to the BMS. It is connected. Before ignition, the KL15 switch is off, there is no signal input, and the BMS is not activated; after ignition, the KL15 switch is closed, and the power management chip is enabled, and sends a KL15 hard-coded wake-up signal to the BMS. Start the vehicle by waking up the BMS. Therefore, the device wake-up signal in the vehicle may be a KL15 hard-coded wake-up signal, which the BMS obtains after ignition of the vehicle.

The presence of a device wake-up signal is the first condition under which the charging circuit can be turned on, and the presence of a power terminal voltage of the charging circuit of the battery on the device is greater than a first threshold under which the charging circuit can be turned on. A second condition under which the charging circuit may be turned on, the rate of change of the power supply terminal voltage of the battery charging circuit on the device within the first length of time being less than a second threshold, is a third condition under which the charging circuit may be turned on. This is the condition.

If there is no wake-up signal and the first condition is not met, it indicates that the vehicle has not been started, and at this time, if the charging circuit is turned on, a large current discharge will occur in the above-mentioned lithium battery charging circuit, and the lithium This can cause the battery to overcharge and cause problems with battery thermal runaway. If there is a wake-up signal and the first condition is met, it indicates that the vehicle is being started and the charging circuit can be turned on.

In order to further avoid turning on the charging circuit when the vehicle is not started, we also collect some parameters of the battery in the BMS and make corresponding decisions. For example, the power terminal voltage of a battery charging circuit can be collected. The power supply terminal voltage is the output voltage of the generator, and is, for example, the voltage at point a connected to the first port of the generator in FIG. Point a is located outside the first switching unit K1 on the charging circuit A1 (here, "outside" refers to being connected to the outside of the battery), and the voltage at point a is is the external voltage of the first switching unit K1 on circuit A1. Since point a is also connected to the first port of the lead-acid battery, it can be understood that the outside voltage is also the voltage of the lead-acid battery. By connecting point a to the sampling port of the BMS, sampling of the voltage at point a can be realized. The first switching unit K1 may be an element capable of turning on and off a circuit, such as a relay. It can be seen that the first switching unit is inside the lithium battery.

By setting a first threshold value on the power supply terminal voltage of the battery charging circuit, the voltage is below the first threshold value, indicating that the second condition is not satisfied and the vehicle has not been started, and the charging circuit is activated. Can't turn it on. If the voltage is greater than the first threshold and satisfies the second condition, it indicates that the vehicle is being started and the charging circuit can be turned on.

In normal cases, after being parked for a long time, the voltage of a lead-acid battery after it has been left standing can be higher than that of a lithium battery. After the vehicle starts and the engine speed becomes idling, the output voltage of the generator is in a normal state and is generally higher than the maximum voltage of the lead-acid battery after it is left at rest. Therefore, the first threshold value can be set based on the output voltage of the generator and the highest voltage after the lead-acid battery is left standing. The first threshold value can be set to be less than the output voltage of the generator and greater than the highest voltage after the lead-acid battery is left standing for a certain period of time or more after being fully charged. For example, if the output voltage of the generator is 28±0.3V and the maximum voltage of the lead-acid battery drops from 29V to about 26V after being left standing for 300 seconds, the first threshold value should be set higher than 26V and lower than 27.7V. is also set to a small value, for example 27V. If the power supply terminal voltage of the charging circuit is less than or equal to the first threshold value, this indicates that the vehicle has not been started. If the voltage is greater than a first threshold, it indicates that the vehicle is being started. The above-mentioned fixed time can be set based on the time for the voltage to drop to a certain stable value after the lead-acid battery has been left standing.For example, the fixed time can be set based on the time for the voltage to drop to a certain stable value after the lead-acid battery has been left standing. Set to the shortest amount of time necessary for the drop to occur.

The voltage of a lead-acid battery may become higher than that of a lithium battery after it is fully charged and left to stand still; however, with a lead-acid battery, if the vehicle stops after being fully charged, When the charging circuit of a lead-acid battery is disconnected, the voltage of the lead-acid battery will drop to a certain extent if the battery is left standing for a certain period of time. Therefore, by setting a second threshold to the rate of change within the first time length of the power supply terminal voltage of the battery charging circuit, if the rate of change is equal to or greater than the second threshold, the third condition is satisfied. First, it indicates that the vehicle has lost power and has not been started, and the charging circuit cannot be turned on. If the rate of change is less than a second threshold and a third condition is met, it indicates that the vehicle is being started and the charging circuit can be turned on.

The BMS can calculate a rate of change of the power terminal voltage within the first time length based on the acquired power terminal voltage, and can compare the rate of change with a second threshold. The first time length can be determined based on the time range in which the lead-acid battery becomes fully charged and the rate of voltage change becomes significant after the power is turned off and left standing, and the second threshold value is: It can be set based on the minimum value of the rate of change between the highest voltage after the lead-acid battery is fully charged and the highest voltage after a certain period of time has elapsed after the power is turned off and left standing. The second threshold value can be set to less than the minimum value of the rate of change between the highest voltage after the lead-acid battery is fully charged and the highest voltage after a certain period of time has elapsed after the power is turned off and left standing. can. For example, if the time range in which the rate of voltage change after full charge of the lead-acid battery is significant is 5 minutes (300 seconds), the first time length can be set to 300 seconds. If the maximum voltage of a lead-acid battery after full charge is 29V, and the voltage drops to 26V after turning off the power and leaving it for 300 seconds, the second threshold value is set to (29-26)/29=less than 10.34%. It can be set to a value, for example 10%.

As a result of the above, S103 closes the first switching unit in the charging circuit and turns on the charging circuit only when the first condition, the second condition, and the third condition are all satisfied. Control.

If any of the first, second, and third conditions above are not met, the charging circuit may not be turned on, the charging circuit may remain off, or the charging circuit may be turned off. be able to understand what to do.

closing the first switching unit in the charging circuit by issuing a first command to the first switching unit in the charging circuit via a Battery Management Unit (BMU) interface on the BMS; , can be controlled to turn on the charging circuit. The first command may be a high or low level signal.

A circuit control method according to an embodiment of the present application acquires a device wake-up signal and a power supply terminal voltage of a charging circuit, and also provides a method for determining whether the power supply terminal voltage of the charging circuit is greater than a first threshold value and within a first time length. is less than a second threshold, the device wake-up signal is present only after the device has been started, the power supply terminal voltage of the charging circuit is greater than the first threshold, and the first time. Since the rate of change within the length is less than the second threshold, this method controls the battery charging circuit to turn on when all the above conditions are met, so that the battery charging circuit is turned on. This allows the battery charging circuit to be turned on when the device is not being started, and then to cause a high current discharge in the battery charging circuit when the device is started. This prevents the switch on the charging circuit from sticking, avoids thermal runaway caused by overcharging of the lithium battery, and improves battery safety.

In some embodiments, other conditions for turning on the charging circuit may also be set. FIG. 4 is a flowchart of a circuit control method provided by some embodiments of the present application. As shown in FIG. 4, the circuit control method includes:
S101, obtaining a device wake-up signal;
In S102, it is determined whether the power supply terminal voltage of the battery charging circuit on the device is greater than a first threshold and the rate of change within the first time length is less than a second threshold. , the charging circuit is a circuit connecting the battery on the device and the generator, and the power supply terminal voltage is the output voltage of the generator;
S403, determining whether the SOC of the battery is greater than a third threshold, whether the battery has a failure alarm, and whether the battery cell temperature of the battery is within a first range; and,
In step S404, the power supply terminal voltage of the battery charging circuit on the device is greater than a first threshold, the rate of change within the first time length is less than a second threshold, and the SOC of the battery is greater than a third threshold. If the threshold is greater than the threshold, the battery has no fault alarm, and the battery cell temperature of the battery is within a first range, the first switching unit in the charging circuit is closed and the charging circuit is controlled to turn on. a first instruction step to do so.

Here, the specific implementation process of S101 and S102 is basically the same as S101 and S102 in the above embodiment, and the above description can be referred to for the implementation process.

The SOC of the battery being greater than the third threshold is a fourth condition under which the charging circuit may be turned on, and the absence of a fault alarm on the battery is a fifth condition under which the charging circuit may be turned on. , the battery cell temperature of the battery being in the first range is a sixth condition under which the charging circuit may be turned on.

SOC refers to the state of charge. The BMS acquires the SOC of the lithium battery and determines whether the SOC is greater than a third threshold. The third threshold value can be determined based on the reduced value of the cell voltage of the lithium battery due to depolarization of the battery cell after the lithium battery is fully charged and its charging circuit is turned off. For example, the third threshold is 95%. After the lithium battery is fully charged and its charging circuit is turned off, the cell voltage of the lithium battery will decrease due to depolarization of the battery cell, so if the charging circuit is closed at this time, it will cause floating charging. Put it away. Therefore, the fourth condition under which the charging circuit can be turned on is that the SOC is larger than the third threshold, and the charging circuit can be controlled to be turned on only when the SOC is larger than the third threshold. This avoided the floating charge problem mentioned above.

If there is a failure alarm on the battery, the battery charging operation will not be possible, otherwise it will easily lead to safety problems. There is no failure alarm in the battery, and the charging circuit can be controlled to turn on only when the fifth condition is met, avoiding safety problems.

When charging a battery, it is necessary to ensure that the temperature of the battery cells within it is within a range that allows charging, otherwise it is likely to lead to safety hazards. The first range is a range that allows this charging, and is, for example, 0 to 55°C. The charging circuit could be controlled to turn on only when the battery cell temperature of the battery was within the first range and the sixth condition was satisfied, thus avoiding safety problems.

The above-mentioned fourth condition, fifth condition, and sixth condition, together with the above-mentioned first condition, second condition, and third condition, are necessary conditions for determining whether or not the charging circuit can be turned on. be done. Therefore, S404 controls the first switching unit in the charging circuit to close and turn on the charging circuit only after all of the above conditions are met.

It can be understood that if any of the above conditions are not met, neither will turn on the charging circuit, thereby maintaining the off state of the charging circuit or turning off the charging circuit.

In the above embodiment, determining whether the SOC of the battery is greater than a third threshold value, whether the battery has a failure alarm, and whether the battery cell temperature of the battery is within the first range. By controlling the charging circuit of the battery to be turned on only when the SOC of the battery is greater than the third threshold, the battery has no failure alarm, and the battery cell temperature of the battery is within the first range. , can avoid battery floating charging and safety problems.

In some embodiments, technical solutions are also provided how to control the turning off of the battery charging circuit after it is turned on. FIG. 5 is a flowchart of a circuit control method provided by some embodiments of the present application. As shown in FIG. 5, the circuit control method includes:
S501, after the charging circuit of the battery is turned on, whether the rate of change of the charging current of the battery within the second length of time is greater than a fourth threshold value, or the rate of change of the battery cell in the battery; determining whether the voltage is above a fifth threshold, or whether the battery has a fault alarm, or whether the temperature of the battery cell is not within the first range;
S502, if the rate of change of the charging current of the battery within the second time length is greater than the fourth threshold, or if the voltage of the battery cell in the battery is greater than or equal to the fifth threshold; a second command for controlling the first switching unit in the charging circuit to turn off and turning off the charging circuit if there is a fault alarm or the temperature of the battery cell is not in the first range; and a step of emitting.

Here, the first condition that the charging circuit needs to be turned off is that the rate of change of the battery charging current within the second time length is greater than the fourth threshold, and the rate of change of the battery charging current within the second time length is the first condition that requires turning off the charging circuit, The voltage being above the fifth threshold is the second condition that requires the charging circuit to be turned off, and the presence of a failure alarm on the battery is the third condition that the charging circuit must be turned off. and the fact that the temperature of the battery cell is not within the first range is the fourth condition that requires the charging circuit to be turned off.

Normally, after starting the vehicle, the battery charging circuit is turned on and the generator charges the lithium battery. After the vehicle stops, if the voltage of the lead-acid battery is greater than the first threshold (eg, >27V), then the lead-acid battery charges the lithium battery and the charging circuit remains on. If started immediately after a stop, if the charging circuit is on, it will cause a high current discharge in the charging circuit, causing the switch (e.g. relay) on the charging circuit to stick, thereby overcharging the lithium battery. This can cause the battery to run out of heat, causing safety accidents such as battery fire. Therefore, it is necessary to set conditions to control the switching off of the battery charging circuit suitable for such cases, for example, when the vehicle is stopped (not started), the battery charging circuit is switched off. There is a need to.

After the vehicle starts, the generator charges the lithium battery, and the battery charging current is normal value, and when it suddenly stops, the charging current quickly drops to 0, so the change in the battery charging current within the second time length. The first condition under which the charging circuit needs to be turned off is that the rate of change is greater than the fourth threshold, and the rate of change of the battery charging current within the second time length is less than or equal to the fourth threshold; If the condition is not met, it indicates that the vehicle is started and not stopped, and there is no need to turn off the charging circuit, and the charging circuit can be kept on. If the rate of change of the battery charging current within the second time length is also greater than the fourth threshold and the first condition is met, it indicates that the vehicle has stopped and the charging circuit must be turned off, as described above. Avoided the overcharging problem of lithium batteries.

The BMS may calculate a rate of change in the charging current within the second time length based on the obtained battery charging current and compare it with a fourth threshold. Since it takes a certain amount of time for the output current of the generator to change from a normal value to no output, the second time length and the fourth time length are determined based on this time and the rate of change at which the current changes from a normal value to no output. Thresholds can be set. For example, since it takes about 1 s for the output current of the generator to change from a normal value of 110 A to no output 0 A, the second time length can be set to 1 s and the fourth threshold value can be set to 110 A.

When charging a battery, overcharging protection is required to prevent overcharging. Therefore, by setting the fifth threshold value, it is possible to protect the battery from overcharging. The fifth threshold value can be set based on the battery overcharge protection mechanism, for example, the fifth threshold value is set to 3.65V. If the voltage of the battery cells in the battery is above the fifth threshold and satisfies the second condition, in this case it is necessary to turn off the charging circuit, avoiding overcharging of the lithium battery. If the voltage of the battery cells in the battery is less than the fifth threshold and the second condition is not met, there is no need to turn off the charging circuit and the charging circuit can be kept on.

If there is a failure alarm on the battery, the battery charging operation will not be possible, otherwise it will easily lead to safety problems. In this case, it was necessary to satisfy the third condition and control the charging circuit to turn off, thereby avoiding safety problems.

When charging a battery, it is necessary to ensure that the temperature of the battery cells within it is within a range that allows charging, otherwise it is likely to lead to safety hazards. The first range is a range that allows this charging, and is, for example, 0 to 55°C. If the battery cell temperature of the battery is not within the first range and satisfies the fourth condition, it is necessary to control the charging circuit to turn off, thereby avoiding safety problems.

The first condition, the second condition, the third condition, and the fourth condition are considered to be sufficient conditions for determining whether or not it is necessary to turn off the battery charging circuit after the battery charging circuit is turned on. Ru. Therefore, S502 can be controlled to turn off the first switching unit in the charging circuit to turn off the charging circuit when any of the above conditions is satisfied.

A second command is issued to the first switching unit in the charging circuit via the BMU interface on the BMS to turn off the first switching unit in the charging circuit to turn off the charging circuit. can be controlled. The second command may be a high or low level signal.

It can be appreciated that in some embodiments, the circuit control method may further include steps in any of the embodiments of FIGS. 1-4, or a combination of steps of these embodiments.

In some embodiments, the absence of a device wake-up signal indicates that the vehicle has not been started, at which time the charging circuitry also needs to be controlled to turn off.

In the above embodiment, whether the rate of change of the charging current of the battery within the second time length is greater than a fourth threshold, or whether the voltage of a battery cell in the battery is greater than or equal to a fifth threshold; or whether the battery has a fault alarm or the temperature of the battery cell is not within the first range so that the rate of change of the battery's charging current within the second length of time is within the first range. If the voltage of the battery cell in the battery is greater than or equal to the fifth threshold, or if the battery has a fault alarm, or if the temperature of the battery cell is not within the first range, charging The circuit was controlled to turn off, thereby ensuring that the charging circuit was turned off when the vehicle was not started, avoiding overcharging of the lithium battery and safety hazards.

In the above embodiment, determining whether the SOC of the battery is greater than a third threshold value, whether the battery has a failure alarm, and whether the battery cell temperature of the battery is within the first range. By controlling the charging circuit of the battery to be turned on only when the SOC of the battery is greater than the third threshold, the battery has no failure alarm, and the battery cell temperature of the battery is within the first range. , can avoid battery floating charging and safety problems.

Lead-acid batteries have a short lifespan due to their large weight and high self-discharge rate, which can reach 20% to 30% per month. If the vehicle was left unattended for a long time, the lead-acid battery ran out of electricity, making it impossible to start the vehicle. Therefore, in some embodiments, technical means are also provided on how to control the charging circuit to turn on when the battery is left unused for a long time. FIG. 6 is a flowchart of a circuit control method provided by some embodiments of the present application. As shown in FIG. 6, the circuit control method includes:
S601, determining whether there is a device wake-up signal and whether the power terminal voltage is less than a sixth threshold;
In S602, if there is a device wake-up signal and the power terminal voltage is less than the sixth threshold, the first switching unit in the charging circuit is closed, the charging circuit is turned on, and the charging circuit is turned on. issuing a third command for controlling the controller to be in the first on state.

The sixth threshold value can be set based on the maximum value of voltage when the lead acid battery runs out of power, and the sixth threshold value can be set to the maximum value of voltage when the lead acid battery runs out of power. . For example, if the voltage of the lead-acid battery in a depleted state is about 16V to 22V, the sixth threshold value can be set to 22V. If the power terminal voltage is below this value, it indicates that the lead-acid battery is in a depleted state, and the charging circuit can be turned on and the lead-acid battery can be charged, providing power for starting the following vehicle, and the lead-acid battery can be charged. It is possible to extend the service life of the vehicle and extend the time the vehicle is left unused.

Here, the presence of a device wake-up signal is the first condition under which the charging circuit may be turned on, and the power supply terminal voltage being less than a sixth threshold is the second condition under which the charging circuit may be turned on. It is a condition. Both the first condition and the second condition are necessary conditions for determining whether or not the charging circuit can be turned on. Therefore, S602 controls the first switching unit in the charging circuit to close and turn on the charging circuit only when all of the above conditions are met.

It can be understood that if any of the above conditions are not met, neither will turn on the charging circuit, thereby maintaining the off state of the charging circuit or turning off the charging circuit.

The first switching unit of the charging circuit may be controlled to close and turn on the charging circuit by issuing a third command to the first switching unit of the charging circuit via the BMU interface on the BMS. can. This third command may be a high or low level signal.

In some embodiments, in step S602, if there is a device wake-up signal and the power terminal voltage is less than a sixth threshold, a third command is issued with a delay of time t to turn on the charging circuit. You may also add a delay condition such as issuing . When the key is inserted into the keyhole on the vehicle and rotated, it is first located in the ACC range, and at this time (not yet in the ON range for firing), the BMS detects the device wake-up signal (KL15). At this time, if it is detected that the power supply terminal voltage is less than the sixth threshold value, a third command is issued to turn on the charging circuit. If a fire occurs and the vehicle is started while the charging circuit is on, the lithium battery will be discharged and the engine will start, causing the aforementioned battery to run out of heat and cause a safety accident such as the battery catching fire. Therefore, by setting a certain delay time t and also turning on the charging circuit, it is possible to already start the vehicle when the charging circuit of the battery is turned on, and when the vehicle is not started. The battery charging circuit is turned on, causing a large current discharge in the battery charging circuit when the following vehicle is started, avoiding the switch on the charging circuit from sticking, and preventing battery thermal runaway due to overcharging of the lithium battery. Avoid and improve battery safety. The delay time t is set to satisfy the key operation time length from the ACC range to the ON range, and can be set to, for example, 10s, 30s, or 60s. It can be appreciated that in some embodiments, the circuit control method may further include steps in any of the embodiments of FIGS. 1-5, or a combination of steps of these embodiments.

In the above embodiment, determining whether there is a device wake-up signal and whether the power terminal voltage is less than the sixth threshold determines whether the device wake-up signal is present and the power terminal voltage is less than the sixth threshold. 6, the charging circuit is turned on to charge the lead-acid battery from the lithium battery, and if the vehicle is left alone for a long time, the lead-acid battery will run out of power and the vehicle will not be able to start. Avoided the problem.

In some embodiments, in addition to the embodiment shown in FIG. 6, other conditions for turning on the charging circuit may be set. FIG. 7 is a flowchart of a circuit control method provided by some embodiments of the present application. As shown in FIG. 7, the circuit control method includes:
S701, determining whether there is a device wake-up signal and whether the power terminal voltage is less than a sixth threshold;
S702, determining whether the SOC of the battery is greater than a seventh threshold and whether there is a failure alarm for the battery;
At S703, if there is a device wake-up signal, the power supply terminal voltage is less than the sixth threshold, the battery SOC is greater than the seventh threshold, and the battery does not have a fault alarm, the closing the first switching unit, turning on the charging circuit, and issuing a third command for controlling the charging circuit to the first on state.

The specific implementation process of S701 is basically the same as S601 in the above embodiment, and the above description can be referred to for the implementation process.

The SOC of the battery being greater than the seventh threshold is a third condition under which the charging circuit may be turned on, and the absence of a fault alarm on the battery is a fourth condition under which the charging circuit may be turned on. .

If the vehicle is left unattended for a long time and the lead-acid battery continues to be charged from the lithium battery, the lithium battery may become over-discharged. Overdischarge increases the internal pressure of the lithium battery, destroys the reversibility of the positive and negative electrode active materials, and significantly reduces the capacity. Therefore, by setting the seventh threshold value, if the SOC of the battery is below the seventh threshold value, it indicates that the battery is no longer suitable for re-discharge, and at this time, the third condition is no longer satisfied, and the charging circuit to avoid over-discharging of the lithium battery by continuing to charge the lead-acid battery from the lithium battery when the vehicle is left unused for a long time. The charging circuit is turned on to charge the lead-acid battery from the lithium battery only if the SOC of the battery is greater than a seventh threshold. The seventh threshold value can be set based on the discharge cutoff SOC value of the lithium battery. For example, the seventh threshold is set to 15%.

If there is a failure alarm on the battery, the battery charging operation will not be possible, otherwise it will easily lead to safety problems. Safety problems were avoided by controlling the charging circuit to turn on only when the battery had no failure alarm and the fourth condition was met.

The above-mentioned third condition and fourth condition, together with the first condition and second condition in S601, are necessary conditions for determining whether or not the charging circuit can be turned on. Therefore, S703 controls the first switching unit in the charging circuit to close and turn on the charging circuit only after all of the above conditions are met.

It can be understood that if any of the above conditions are not met, neither will turn on the charging circuit, thereby maintaining the off state of the charging circuit or turning off the charging circuit.

In the above embodiment, by determining whether the SOC of the battery is greater than the seventh threshold and whether the battery has a failure alarm, the SOC of the battery is greater than the seventh threshold, and The charging circuit is controlled to turn on when there is no battery failure alarm, avoiding over-discharge of lithium batteries and safety issues.

In some embodiments, technical means are also provided how to control the charging circuit to turn off after the battery is left unused for a long time and its charging circuit is controlled to turn on. There is. FIG. 8 is a flowchart of a circuit control method provided by some embodiments of the present application. As shown in FIG. 8, the circuit control method includes:
S801, determining whether the on-time of the charging circuit is greater than an eighth threshold in the first on-state;
In S802, if the on-time of the charging circuit is greater than the eighth threshold, a fourth command for controlling the charging circuit to turn off by turning off the first switching unit in the charging circuit; and a step of emitting.

The on-time of the charging circuit being greater than the eighth threshold is the first condition under which the charging circuit needs to be turned off. The first on state is different from the first on state in the embodiment shown in FIG. 6 or 7, that is, the on state of the charging circuit according to the embodiment shown in FIGS. After leaving the battery for a certain period of time, the battery charging circuit is controlled to be turned on, and the charging circuit is in the on state at this time.

In order to solve the problem that the vehicle cannot be started due to lack of electricity in the lead-acid battery after the vehicle has been left alone for a long time, the lead-acid battery is charged from the lithium battery according to the embodiment shown in FIGS. 6 and 7 above. be able to. Once the lead-acid battery has been charged from the lithium battery until the amount of power required to start the vehicle at one time is met, charging can be stopped. Therefore, by setting the eighth threshold value, when the on-time of the charging circuit becomes greater than the eighth threshold value, the amount of power of the lead-acid battery becomes smaller than the amount of power required for the vehicle to start at one time. The charging circuit can be turned off and charging can be stopped. The eighth threshold can be set based on the time required to charge the lead-acid battery until the amount of power required for starting the vehicle at one time is met.

turning off the first switching unit in the charging circuit by issuing a fourth command to the first switching unit in the charging circuit via the BMU interface on the BMS to turn off the charging circuit; can be controlled. This fourth command may be a high or low level signal.

In some embodiments, other conditions for turning off the charging circuit may also be set, for example, the absence of a device wake-up signal is a second condition that requires turning off the charging circuit. , the absence of a fault alarm on the battery is the third condition that requires the charging circuit to be turned off. The above first condition, second condition, and third condition are sufficient conditions for determining whether or not it is necessary to turn off the battery charging circuit after the battery charging circuit is turned on. When any of the above conditions is met, the first switching unit in the charging circuit can be turned off to control the charging circuit to be turned off.

In the above embodiment, by determining whether the on-time of the charging circuit is greater than the eighth threshold, if the on-time of the charging circuit is greater than the eighth threshold, the charging circuit is turned off. This not only ensures that the lead-acid battery is charged from the lithium battery until the amount of power required for the vehicle to start at one time is met, but also avoids over-discharging of the lithium battery.

In some embodiments, technical solutions are also provided on how to control the turning on of the battery discharge circuit. FIG. 9 is a flowchart of a circuit control method provided by some embodiments of the present application. As shown in FIG. 9, the circuit control method includes:
S901, determining whether the SOC of the battery is greater than a seventh threshold;
S902, if the SOC of the battery is greater than the seventh threshold, a fifth command for controlling the second switching unit in the discharge circuit of the battery to close and turn on the discharge circuit; and the discharging circuit is a circuit connecting a battery on the device and a power receiving device.

Here, the discharge circuit is a circuit that connects the battery on the device and the power receiving device, and specifically, the discharge circuit B1 that connects the lithium battery and the power receiving device in FIG. 2, and the discharge circuit B1 in FIG. can do. The second switching unit may be K2 in FIG. 2, or may be an element such as a relay that turns on and off a circuit. It can be seen that the second switching unit is internal to the lithium battery.

The SOC of the battery being greater than the seventh threshold is the first condition under which the discharge circuit may be turned on.

A lithium battery is a power source that supplies power to a power receiving device, such as a battery that supplies power to a parking air conditioner. If the power-receiving device is operating for a long time and the lithium battery continues to supply power to the power-receiving device, the lithium battery may over-discharge. Overdischarge increases the internal pressure of the lithium battery, destroys the reversibility of the positive and negative electrode active materials, and significantly reduces the capacity. Therefore, by setting the seventh threshold, if the SOC of the battery is below the seventh threshold, it indicates that the battery is no longer suitable for discharging, and at this time, the first condition is no longer satisfied and the discharging circuit is closed. This avoids over-discharging of the lithium battery due to the lithium battery continuing to supply power to the receiving device. Only when the SOC of the battery is greater than the seventh threshold value will the discharge circuit be turned on and the lithium battery will supply power to the power receiving equipment. The seventh threshold value can be set based on the discharge cutoff SOC value of the lithium battery. For example, the seventh threshold is set to 15%.

issuing a fifth command to the second switching unit in the discharge circuit via the BMU interface on the BMS to close the second switching unit in the discharge circuit and turn on the discharge circuit; can be controlled. The fifth command may be a high or low level signal.

In some embodiments, other conditions may be set for turning on the discharge circuit, for example, the presence of a device wake-up signal is a second condition under which the discharge circuit may be turned on, The absence of a fault alarm is the third condition under which the discharge circuit may be turned on. Together with the first condition, second condition, and third condition, this is a necessary condition for determining whether or not the discharge circuit is turned on. Only when all of the above conditions are met is the second switching unit in the discharge circuit closed and controlled to turn on the discharge circuit.

It can be understood that if any of the above conditions are not met, neither will turn on the discharge circuit, thereby maintaining the off state of the discharge circuit or turning off the discharge circuit.

In the above embodiment, by determining whether the SOC of the battery is greater than the seventh threshold, if the SOC of the battery is greater than the seventh threshold, the battery discharging circuit is controlled to be turned on. This avoids over-discharge of lithium batteries.

In some embodiments, technical solutions are also provided how to control the turning off of the battery discharge circuit after it is turned on. FIG. 10 is a flowchart of a circuit control method provided by some embodiments of the present application. As shown in FIG. 10, the circuit control method includes:
S1001, after the discharge circuit of the battery is turned on, there is no device wake-up signal, or there is a fault alarm on the battery, or the SOC of the battery is less than or equal to a seventh threshold; a step of determining whether or not;
In S1002, if there is no device wake-up signal, or if the battery has a fault alarm, or if the SOC of the battery is less than or equal to the seventh threshold, the second switching part in the discharge circuit is turned off and the discharge is stopped. issuing a sixth command to control the circuit to turn off.

Here, the absence of a device wake-up signal is the first condition under which the discharge circuit must be turned off, and the presence of a fault alarm on the battery is the second condition under which the discharge circuit must be turned off. The fact that the SOC of the battery is less than or equal to the seventh threshold is the third condition that requires turning off the discharge circuit.

The absence of a device wake-up signal indicates that the vehicle has not been started. At this time, there is no need to supply power from the lithium battery to the electrical equipment, the first condition is not satisfied, and there is no need to control the discharge circuit to turn on.

If the battery has a fault alarm, the battery cannot be discharged, otherwise it is likely to cause safety problems. At this time, it was necessary to control the discharge circuit so as to satisfy the second condition and turn off the discharge circuit, thereby avoiding safety problems.

If the power-receiving device is operating for a long time and the lithium battery continues to supply power to the power-receiving device, the lithium battery may over-discharge. Overdischarge increases the internal pressure of the lithium battery, destroys the reversibility of the positive and negative electrode active materials, and significantly reduces the capacity. Therefore, by setting the seventh threshold, if the SOC of the battery is below the seventh threshold, it indicates that the battery is no longer suitable for discharging, and at this time, the third condition is met and the discharging circuit is turned off. This avoided over-discharging of the lithium battery due to the lithium battery continuing to supply power to the receiving device. The seventh threshold value can be set based on the discharge cutoff SOC value of the lithium battery. For example, the seventh threshold is set to 15%.

The first condition, second condition, and third condition described above are sufficient conditions for determining whether or not it is necessary to turn off the discharge circuit of the battery after the discharge circuit of the battery is turned on. Therefore, S1002 can be controlled to turn off the second switching unit in the discharge circuit to turn off the discharge circuit when any of the above conditions is met.

controlling the second switching unit in the discharge circuit to turn off and turn off the discharge circuit by issuing a sixth command to the second switching unit in the discharge circuit through the BMU interface on the BMS; can do. The sixth command may be a high or low level signal.

It can be appreciated that in some embodiments, the circuit control method may further include the steps in the embodiment shown in FIG.

In the above embodiments, the device wake-up signal may be activated by determining whether there is no device wake-up signal, or whether there is a fault alarm on the battery, or whether the SOC of the battery is less than or equal to the seventh threshold. If there is no up signal, or the battery has a fault alarm, or the SOC of the battery is below the seventh threshold, it will control the discharge circuit to turn off, preventing lithium battery over-discharge and safety problems. avoided.

The circuit control method according to the embodiment of the present application has been described above with reference to FIGS. 1 to 10. Hereinafter, the battery controller according to the embodiment of the present application will be explained with reference to FIG. For parts that are not explained, each of the above embodiments can be referred to. FIG. 11 is a schematic configuration diagram of a battery controller provided by some embodiments of the present application, and as shown in FIG. 11, a battery controller 1100 executes the steps of the circuit control method according to the embodiments described above. includes one or more processors 1101 operating singly or jointly for the purpose of processing.

Hereinafter, a battery management system according to an embodiment of the present application will be described with reference to FIG. 12, and the above-mentioned embodiments can be referred to for parts not described in detail. FIG. 12 is a schematic configuration diagram of a battery management system provided by some embodiments of the present application. As shown in FIG. 12, a battery management system 1200 includes at least one processor 1201 and the at least one processor 1201 and a memory 1202 communicatively connected to the processor 1201, the memory 1202 stores instructions executable by the at least one processor 1201, and executes the steps of the circuit control method according to the above embodiment. The instructions are executed by the at least one processor 1201 to cause the at least one processor 1201 to implement.

Hereinafter, a battery according to an embodiment of the present application will be described with reference to FIG. 13, and the parts not described in detail here can refer to each of the above embodiments. FIG. 13 is a schematic configuration diagram of a battery provided by some embodiments of the present application, and as shown in FIG. 13, a battery 1300 includes a battery controller 1100 shown in FIG. 11.

Hereinafter, a battery according to an embodiment of the present application will be described with reference to FIG. 14, and parts not described in detail here can refer to each of the above embodiments. FIG. 14 is a schematic configuration diagram of a battery provided by some embodiments of the present application, and as shown in FIG. 14, a battery 1400 includes a battery management system 1200 shown in FIG. 12.

Hereinafter, a power receiving device according to an embodiment of the present application will be described with reference to FIG. 15, and the above-mentioned embodiments can be referred to for parts not explained in detail here. FIG. 15 is a schematic configuration diagram of a power receiving device provided by some embodiments of the present application. As shown in FIG. 15, a power receiving device 1500 includes the battery 1300 or the battery 1400 according to the above embodiments.

Hereinafter, a vehicle according to an embodiment of the present application will be described with reference to FIG. 16, and parts not described in detail here can refer to each of the above embodiments. FIG. 16 is a schematic configuration diagram of a vehicle provided by some embodiments of the present application. As shown in FIG. The lithium battery 1601 and the generator 1602 are connected here to form a charging circuit, and the lithium battery 1601 is
obtaining vehicle wake-up;
determining whether the power supply terminal voltage of the charging circuit for the lithium battery on the vehicle is greater than a first threshold and the rate of change within a first time length is less than a second threshold; the circuit is a circuit connecting a lithium battery on the vehicle and a generator, and the power supply terminal voltage is an output voltage of the generator;
a first switching unit in the charging circuit when the power supply terminal voltage of the battery charging circuit on the vehicle is greater than a first threshold and the rate of change within the first time length is less than the second threshold; a battery management system 1604 used for the step of issuing a first command for controlling to close the charging circuit and turn on the charging circuit.

Finally, it must be explained that the above embodiments are only for explaining the technical solution of the present application, and are not intended to limit the present application. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art will still be able to modify the technical solutions described in the above embodiments, or modify some of the constituent elements therein. It should be understood that all may be equally replaced, and these amendments or substitutions should cause the essence of the corresponding technical solution to depart from the scope of the technical solution of each embodiment of the present application. Rather, all of these should be included within the scope of the claims and specification of this application. In particular, unless there is a structural conflict, the constituent elements mentioned in each embodiment may be combined in any manner. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims (13)

obtaining a device wake-up signal;
determining whether the power supply terminal voltage of a battery charging circuit on the device is greater than a first threshold and the rate of change within a first time length is less than a second threshold; a circuit connecting a battery on the device and a generator, the power terminal voltage being the output voltage of the generator;
If the power supply terminal voltage of the battery charging circuit on the device is greater than a first threshold and the rate of change within the first time length is less than a second threshold, first switching in the charging circuit; A circuit control method comprising: issuing a first command to control the unit to close the circuit and turn on the charging circuit. determining whether the state of charge SOC of the battery is greater than a third threshold, whether the battery has a failure alarm, and whether the battery cell temperature of the battery is within a first range; further including;
If the power supply terminal voltage of a battery charging circuit on the device is greater than a first threshold and the rate of change within a first time period is less than a second threshold, issuing a first command comprises: ,
The power supply terminal voltage of a charging circuit of a battery on the device is greater than a first threshold, the rate of change within a first time period is less than a second threshold, and the SOC of the battery is greater than a third threshold. The method of claim 1, further comprising issuing a first command when the battery has no fault alarm and a battery cell temperature of the battery is in a first range. After the charging circuit of the battery is turned on, the rate of change of the charging current of the battery within a second length of time is greater than a fourth threshold, or the voltage of a battery cell in the battery is determined. determining whether the temperature is equal to or higher than a fifth threshold, or whether the battery has a failure alarm, or whether the temperature of the battery cell is not within a first range;
If the rate of change of the charging current of the battery within a second length of time is greater than a fourth threshold, or if the voltage of a battery cell in the battery is greater than or equal to a fifth threshold, or if the battery has a failure alarm. or when the temperature of the battery cell is not in the first range, a first switching unit in the charging circuit is turned off, and a second switching unit for controlling the charging circuit to be turned off. 3. The method according to claim 1, further comprising the step of issuing a command. determining whether there is a device wake-up signal and whether the power terminal voltage is less than a sixth threshold;
If there is a device wake-up signal and the power supply terminal voltage is less than a sixth threshold, a first switching unit in the charging circuit is closed, turning on the charging circuit, and switching the charging circuit to the first switching unit. The method according to any one of claims 1 to 3, further comprising the step of issuing a third command for controlling the method to be turned on. further comprising determining whether the SOC of the battery is greater than a seventh threshold and whether there is a failure alarm for the battery;
If the device wake-up signal is present and the power terminal voltage is less than a sixth threshold, issuing a third command includes:
issuing a third command if there is a device wake-up signal, the power terminal voltage is less than a sixth threshold, the SOC of the battery is greater than a seventh threshold, and there is no failure alarm for the battery; 5. The method of claim 4, further comprising the step of: determining whether the on-time of the charging circuit is greater than an eighth threshold in the first on-state;
If the on-time of the charging circuit is greater than an eighth threshold, turning off a first switching unit in the charging circuit and issuing a fourth command for controlling the charging circuit to turn off. 6. The method of claim 5, further comprising the steps of: determining whether the SOC of the battery is greater than a seventh threshold;
If the SOC of the battery is greater than a seventh threshold, issuing a fifth command for controlling a second switching unit in a discharge circuit of the battery to close and turn on the discharge circuit; 7. The method according to claim 1, further comprising the step of: , the discharge circuit being a circuit connecting a battery on the device and a power receiving device. After a discharge circuit of the battery is turned on, whether there is a device wake-up signal, or whether there is a fault alarm on the battery, or whether the SOC of the battery is less than a seventh threshold. a step of determining whether or not;
If there is a device wake-up signal, or if there is a fault alarm in the battery, or if the SOC of the battery is less than a seventh threshold, the second switching unit of the discharge circuit is turned off and the discharge 8. The method of claim 7, further comprising: issuing a sixth command to control the circuit to turn off. A battery controller characterized in that it comprises one or more processors operating alone or in combination for carrying out the steps of the circuit control method according to any one of claims 1 to 8. at least one processor;
a memory communicatively connected to the at least one processor;
The memory stores instructions executable by the at least one processor, and the instructions for causing the at least one processor to implement the steps of the circuit control method according to any one of claims 1 to 8. A battery management system, wherein instructions are executed by the at least one processor. A battery comprising the battery controller according to claim 9 or the battery management system according to claim 10. A power receiving device comprising the battery according to claim 11 for supplying electric power. The lithium battery includes a lithium battery, a generator, and a vehicle wake-up switch, the lithium battery and the generator are connected to form a charging circuit, and the lithium battery includes:
obtaining vehicle wake-up;
determining whether the power supply terminal voltage of a charging circuit for a lithium battery on the vehicle is greater than a first threshold and a rate of change within a first time length is less than a second threshold; is a circuit connecting a lithium battery on the vehicle and a generator, and the power supply terminal voltage is an output voltage of the generator;
If the power supply terminal voltage of the battery charging circuit on the vehicle is greater than a first threshold and the rate of change within the first time length is less than a second threshold, first switching in the charging circuit; A vehicle comprising a battery management system used for: issuing a first command for controlling the unit to close and turn on the charging circuit.

Images